Saphire/ATI/Powercolor are pretty good brands, though i haven't heard anything bad about the others.
If you're gonna buy a 9600, make sure it's a PRO.
Also, something you may want to do, is wait an extra month, or until you can save up an extra hundred bucks, and buy a Radeon 9700PRO. It's much faster than the 9600, and the price of it has gone down a LOT.
http://www.dealtime.com/xPO-ATI_Radeon_9700_128MB_DDR_8X_AGP
the 9700 pro can be overclocked safely to 9800 speeds, and you'll have one heck of a card.
But the 9600's are great as well.